It fits into your back pocket where it looks like a flashlight. However, if someone gets stupid, you pull it out, open it and much to your attackers chagrin, they're looking at a machine gun. Yes, a folding machine gun. Sad that we need such toys. And would your wife/partner let you have one?

"But be careful not to confuse it for your wallet! A wallet is highly ineffective at killing attackers. And whipping out your machine gun to pay for a hot dog at 7-11 is a definite no-no,"
says Geekologie.